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D( x )
x < 0
x < 0
x in <0:+oo)
1/2-(26*x^3.5) = 0
1/2-26*x^3.5 = 0
-26*x^3.5 = -1/2 // : -26
x^3.5 = 1/52
x^3 = (1/52)^(1/0.5) // ^ 1/3
x = (1/2704)^(1/3)
x = (1/2704)^(1/3)
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